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	<title>YUI Library Examples: YAHOO Global Object: Type-Checking Your Data</title>
    

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<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
	YAHOO.util.Event.throwErrors = true;
}
</script>
</head>
<body id="yahoo-com" class="yui-skin-sam">
<div id="custom-doc" class="yui-t2">
<div id="hd">
	<div id="ygunav">
		<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
		<form action="http://search.yahoo.com/search" id="sitesearchform">
		<input name="vs" type="hidden" value="developer.yahoo.com">
		<input name="vs" type="hidden" value="yuiblog.com">
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			<label for="searchinput">Site Search (YDN &amp; YUIBlog): </label>
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	<div id="pagetitle"><h1>YUI Library Examples: YAHOO Global Object: Type-Checking Your Data</h1></div>
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			  <div class="yui-u first example">

    
	<div class="promo">
	<h1>YAHOO Global Object: Type-Checking Your Data</h1>
	
	<div class="exampleIntro">
	<p>The <a href="http://developer.yahoo.com/yui/yahoo/">Yahoo Global Object</a> includes several useful type-checking methods in the <code>YAHOO.lang</code> object.  Click the Check button in each row to evaluate the data.</p>
			
	</div>	
					
	<div class="example-container module ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="yahoo_type_checking_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<table id="demo">
    <thead>
        <tr>
            <th>Data</th>
            <th>isObject</th>
            <th>isArray</th>
            <th>isFunction</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td><code>null</code></td>
            <td colspan="3"><input type="button" name="demo-1" id="demo-1" value="check"/></td>
        </tr>
        <tr>
            <td><code>[] or new Array()</code></td>
            <td colspan="3"><input type="button" name="demo-2" id="demo-2" value="check"/></td>
        </tr>
        <tr>
            <td><code>{} or new Object()</code></td>
            <td colspan="3"><input type="button" name="demo-3" id="demo-3" value="check"/></td>
        </tr>
        <tr>
            <td><code>function Foo() {}</code></td>
            <td colspan="3"><input type="button" name="demo-4" id="demo-4" value="check"/></td>
        </tr>
        <tr>
            <td><code>new Foo()</code></td>
            <td colspan="3"><input type="button" name="demo-5" id="demo-5" value="check"/></td>
        </tr>
        <tr>
            <td><code>elem.getElementsByTagName('p')</code></td>
            <td colspan="3"><input type="button" name="demo-6" id="demo-6" value="check"/></td>
        </tr>
        <tr>
            <td><code>YAHOO.util.Dom.
                        getElementsByClassName(<br/>
                        'foo','p',elem)</code></td>
            <td colspan="3"><input type="button" name="demo-7" id="demo-7" value="check"/></td>
        </tr>
    <tbody>
</table>
<script type="text/javascript">
    YAHOO.namespace('example');

    YAHOO.example.checkType = function (val) {
        return {
            'object'  : YAHOO.lang.isObject(val),
            'array'   : YAHOO.lang.isArray(val),
            'function': YAHOO.lang.isFunction(val)
        };
    }

    YAHOO.example.populateRow = function (e, data) {
        var cell = this.parentNode,
            row  = cell.parentNode;

        row.removeChild(cell);

        var td0 = document.createElement('td'),
            td1 = td0.cloneNode(false),
            td2 = td0.cloneNode(false);

        var results = YAHOO.example.checkType(data);

        td0.appendChild(document.createTextNode(
            results['object'] ?   'Y' : 'N'));
        td1.appendChild(document.createTextNode(
            results['array'] ?    'Y' : 'N'));
        td2.appendChild(document.createTextNode(
            results['function'] ? 'Y' : 'N'));

        row.appendChild(td0);
        row.appendChild(td1);
        row.appendChild(td2);
    }

    var foo = function () {};
    var f = document.getElementById('demo');

    YAHOO.util.Event.on('demo-1','click',YAHOO.example.populateRow, null);
    YAHOO.util.Event.on('demo-2','click',YAHOO.example.populateRow, []);
    YAHOO.util.Event.on('demo-3','click',YAHOO.example.populateRow, {});
    YAHOO.util.Event.on('demo-4','click',YAHOO.example.populateRow, foo);
    YAHOO.util.Event.on('demo-5','click',YAHOO.example.populateRow, new foo());
    YAHOO.util.Event.on('demo-6','click',YAHOO.example.populateRow,
        f.getElementsByTagName('tr'));
    YAHOO.util.Event.on('demo-7','click',YAHOO.example.populateRow,
        YAHOO.util.Dom.getElementsByClassName('foo','td',f));
</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class="first">YAHOO.lang comes with YAHOO</h2>

<p><code>YAHOO.lang</code> comes bundled with the <a href="http://developer.yahoo.com/yui/yahoo/">YAHOO Global Object</a>.</p>

<textarea name="code" class="HTML" cols="60" rows="1">
<script type="text/javascript" src="http://yui.yahooapis.com/2.9.0/build/yahoo/yahoo-min.js"></script>

</textarea>

</p>If you are using any other YUI components on your page, you should already have <code>YAHOO.lang</code> available.</p>

<h2>Checking types</h2>
<p>In this example, we use a few of the type-checking methods available in <code>YAHOO.lang</code> to test various types of data.</p>

<textarea name="code" class="JScript" cols="60" rows="1">
// Test the input using YAHOO.lang type checking methods
YAHOO.example.checkType = function (val) {
    return {
        'object'  : YAHOO.lang.isObject(val),
        'array'   : YAHOO.lang.isArray(val),
        'function': YAHOO.lang.isFunction(val)
    };
}
</textarea>

<h2>Other type checking methods</h2>
<p><code>YAHOO.lang</code> currently supports the following type checking methods:</p>
<ul>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isArray">isArray</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isBoolean">isBoolean</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isFunction">isFunction</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isNull">isNull</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isNumber">isNumber</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isObject">isObject</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isString">isString</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isUndefined">isUndefined</a></li>
    <li><a href="http://developer.yahoo.com/yui/docs/YAHOO.lang.html#isValue">isValue</a></li>
</ul>

<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?dom&event&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

				</div>
				<div class="yui-u">
					
				
					<div id="examples">
						<h3 class='firstContent'>YAHOO Global Object Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li class='selected'><a href='../yahoo/yahoo_type_checking.html'>Type-Checking Your Data</a></li><li><a href='../yahoo/yahoo_ua_detection.html'>User Agent Detection</a></li><li><a href='../yahoo/yahoo_extend.html'>Creating Class Hierarchies with <code>YAHOO.lang.extend</code></a></li><li><a href='../yahoo/yahoo_augment_proto.html'>Creating a Composition-Based Class Structure Using <code>YAHOO.lang.augmentProto</code></a></li><li><a href='../yahoo/yahoo_augment_object.html'>Add Behavior to Objects or Static Classes with <code>YAHOO.lang.augmentObject</code></a></li><li><a href='../yahoo/yahoo_merge.html'>Combining Simple Data Sets with <code>YAHOO.lang.merge</code></a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>More YAHOO Global Object Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/yahoo/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_yahoo.html">API Documentation</a></li>
</ul>
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